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Question: Battery loses charge after sitting for over 5 hours.

It's gotten a new battery (6 mo. ago), alternator (6 mo. ago), starter (last week), checked all fuses 2 mo. ago.

Car doesn't start without a jump from a trickle charger. Starter clicks as if it's not getting power; when it sits for longer than a day it loses all power and there is no electrical response anywhere.

Once it runs after a jump it runs fine and none of the lights dim out when I'm at a stop, so I don't think it's the alternator. Ran a multimeter test with alternator and it charges good.

Starter's obviously brand new and the problem persists.

Ran a multimeter with one end connected to the negative post on the battery and the other end to the negative terminal that connects to the battery after letting it sit, and it read between 11.8v at its lowest and 12.25v at its highest.

No extreme jumps in voltage from each fuse under hood and in cabin.

I'm boggling my mind as to what it could be. Any ideas would be greatly helpful.